Asp.net core MVC Session

 

public class MyController : Controller

{

  // Define an action method to handle the AJAX request

  [HttpPost] // or [HttpGet] depending on your configuration

  public ActionResult DropdownChanged(string selectedValue)

  {

    // Perform any necessary actions based on the selected value

    // and return the updated data or a JSON response.

    // Example logic:

    if (selectedValue == "option1")

    {

      // Do something when Option 1 is selected

    }

    else if (selectedValue == "option2")

    {

      // Do something when Option 2 is selected

    }

    else if (selectedValue == "option3")

    {

      // Do something when Option 3 is selected

    }

    // Return the updated data or a JSON response.

  }

}

<select id="myDropdown">

  <option value="option1">Option 1</option>

  <option value="option2">Option 2</option>

  <option value="option3">Option 3</option>

</select>

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

<script>

  $(document).ready(function() {

    $('#myDropdown').change(function() {

      var selectedValue = $(this).val();

      // Make an AJAX request to the server with the selected value.

      $.ajax({

        url: '/ControllerName/DropdownChanged', // URL of the action method in the controller

        type: 'POST', // or 'GET' depending on your configuration

        data: { selectedValue: selectedValue },

        success: function(response) {

          // Handle the response from the server, such as updating the UI.

        },

        error: function(xhr, status, error) {

          // Handle any errors that occurred during the AJAX request.

        }

      });

    });

  });

</script>